Union Valley reaches 100° on about 15 days a year, more than 93% of U.S. towns
Nights in January average 35°. Winters are mild: January nights here are milder than in 80% of U.S. towns. The latest 30-year average runs 0.9° warmer than 1901–2000’s, with February up the most. Picnics, hikes and garden evenings come into their own from March to May and October to November, with highs of 66–82°.
A year in Union Valley at a glance
Each month’s typical high and low, and what it brings.
What stands out about Union Valley’s climate
Compared with towns across the U.S., with Union Valley’s place in Texas beside it.
What a year in Union Valley feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 254 frost-free days a year
In half of years the last 32° night comes by March 10 and the first by November 19. Frost and day counts come from NOAA’s station at Lavon Dam, TX, 15 miles from the town’s center, at about the same height.
The 2023 USDA map puts Union Valley’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 17°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 42 inches of rain a year
May is the wettest month and July the driest. Rain falls on about 88 days a year. Snow is rare: about 0.2" in a normal year at Lavon Dam, TX, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Union Valley
53% of the work is heating. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Lavon Dam, TX.
Living with Union Valley’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
254 frost-free days in zone 8b. The last frost comes by Mar 10 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 19.
Months with highs of 62–84° and lows of 40° or more: March, April, May, October and November.
Parks & trails →Of the yearly building losses FEMA expects in Union Valley from natural hazards, river flooding is the largest share (34%); heat waves, cold waves, winter storms and ice storms together are 23%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Union Valley and similar climates
TownRatings has no climate map of the towns around Union Valley yet.
Climates most like Union Valley’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Union Valley, TX | 35° | 94° | 42" | 0.2" |
| Clearlake, CA | 35° | 93° | 40" | 0.4" |
| Cayce, SC | 35° | 93° | 46" | 1.2" |
| Evans, GA | 35° | 92° | 45" | 0.8" |
| Laurinburg, NC | 33° | 91° | 45" | 1.1" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Union Valley averaged 0.9° warmer than the 1900s. The biggest change is in February (+2.2°).
A smaller shift than in 84% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Union Valley compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Union Valley’s place among Texas’.
Union Valley weather by month
Highs, lows and precipitation from NOAA’s grid at Union Valley’s center; snow, wet days and snow on the ground from Lavon Dam, TX. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 56° | 35° | 2.9" | 0.0" | 8 | 0 | 41° – 53° |
| February | 60° | 39° | 3.1" | 0.0" | 7 | 0 | 41° – 58° |
| March | 67° | 46° | 3.9" | 0.0" | 9 | 0 | 52° – 63° |
| April | 75° | 53° | 3.7" | 0.0" | 8 | 0 | 59° – 70° |
| May | 82° | 62° | 4.8" | 0.0" | 9 | 0 | 68° – 77° |
| June | 90° | 70° | 3.9" | 0.0" | 8 | 0 | 77° – 85° |
| July | 94° | 73° | 2.2" | 0.0" | 6 | 0 | 79° – 89° |
| August | 95° | 73° | 2.5" | 0.0" | 5 | 0 | 78° – 91° |
| September | 88° | 66° | 3.1" | 0.0" | 6 | 0 | 73° – 83° |
| October | 78° | 54° | 4.7" | 0.0" | 7 | 0 | 61° – 71° |
| November | 66° | 45° | 3.3" | 0.0" | 7 | 0 | 49° – 61° |
| December | 57° | 37° | 3.7" | 0.2" | 8 | 0 | 39° – 52° |
| Year | 76° | 54° | 41.7" | 0.2" | 88 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 41° to 58°. June is the most reliable, staying within 8°.
Where Union Valley’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Union Valley’s center.
- Snow: Lavon Dam, TX.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Lavon Dam, TX, 15 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Union Valley’s climate
What is the weather like in Union Valley?
A typical July afternoon reaches 94°, a January night drops to 35°, and snow is almost unheard of. Milder January nights than 80% of U.S. towns; hotter July afternoons than 93% of U.S. towns.
How cold does it get in Union Valley in winter?
January nights average 35°. About 44 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 41°.
How much snow does Union Valley get?
About 0.2 inches in a normal winter at Lavon Dam, TX, so most winters see none.
How hot does it get in Union Valley?
July, with a typical high of 94° and a low of 73°. About 95 days a year reach 90° and 15 reach 100° (Lavon Dam, TX).
When is the first and last frost in Union Valley?
In half of years the last spring frost (32°) comes by March 10 and the first fall frost by November 19, about 254 frost-free days, at Lavon Dam, TX.
What growing zone is Union Valley in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 17°.
What is the best time of year to visit Union Valley?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April, May, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Union Valley getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 84% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Union Valley.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.